/*
gcc -o nvidia-vidmode-crash nvidia-vidmode-crash.c -L/usr/X11R6/lib \
	-lX11 -lXext -lXxf86vm
*/
#define _ISOC99_SOURCE 1

#include <stdio.h>
#include <unistd.h>

#include <X11/Xlib.h>
#include <X11/extensions/xf86vmode.h>


int main(int argc, char *argv[])
{
	XF86VidModeModeInfo **vidmodes;
	Display *dpy;
	int screen, maj, min, num;

	if (!(dpy = XOpenDisplay(NULL))) {
		fprintf(stderr, "XOpenDisplay() failed\n");
		return 1;
	}

	screen = DefaultScreen(dpy);
	
	maj = min = 0;
	if (XF86VidModeQueryVersion(dpy, &maj, &min) == False) {
		fprintf(stderr, "XFree86-VidModeExtension not supported\n");
		return 1;
	}

	XF86VidModeGetAllModeLines(dpy, screen, &num, &vidmodes);

	printf("Switching to %dx%d on newline\n", vidmodes[num - 1]->hdisplay,
		vidmodes[num - 1]->vdisplay);
	printf("Once the video mode is switched, switch to the console and\n");
	printf("wait 5 seconds for the mode to be switched back.  Once the\n");
	printf("mode is restored, X will remain in the lower resolution,\n");
	printf("and will crash when attempting to change the mode again (or\n");
	printf("if the mouse leaves the screen to the right or bottom--when\n");
	printf("viewport scrolling would normally happen\n");

	printf("[enter] to switch\n");
	getchar();

	XF86VidModeSwitchToMode(dpy, screen, vidmodes[num - 1]);
	XF86VidModeSetViewPort(dpy, screen, 0, 0);

	XFlush(dpy);
	
	printf("Sleeping for 5 seconds\n");
	sleep(5);

	printf("Restoring video mode\n");
	XF86VidModeSwitchToMode(dpy, screen, vidmodes[0]);

	XCloseDisplay(dpy);
	
	return 0;
}